Synthesis and X-Ray Diffraction Studies of Bis(4-propanoyl-2,4-dihydro-5-methyl-2-phenyl-3 H-pyrazol-3-onato) Dioxomolybdenum(VI) and [4-(1-trichloro-2-ethoxy)propanoyl-2,4-dihydro5-methyl-2-phenyl-3 H-pyrazol-3-onato][4-trichloroacetyl-2,4-dihydro5-methyl-2-phenyl-3 H-pyrazol-3-onato] Dioxomolybdenum(VI)
作者:Bieluonwu A. Uzoukwu、Karsten Gloe、Otto Rademacher
DOI:10.1002/1521-3749(200101)627:1<108::aid-zaac108>3.0.co;2-m
日期:2001.1
Two 4-acyl-2,3-dihydro-5-methyl-2-phenyl-3 H-pyrazol-3-one complexes of molybdenum(VI), namely (4-propanoyl-2,3-dihydro-5-methyl-2-phenyl- H-pyrazol-5-onato) dioxomolybdenum(VI), [MoO2(C26H26N4O4)], 1, and (4-(1-trichloro-2-ethoxy)-propanoyl)-2,4-dihydro-5-methyl-2-phenyl-3 H-pyrazol-3-onato)(4-trichloroacetyl-2,4-dihydro-5-methyl-2-phenyl-3 H-pyrazol-3-onato) dioxomolybdenum(VI), [MoO2(C26H21Cl6N4O5)], 2, have been synthesised from a reaction between MoO2II ion and 4-propanoyl and 4-trichloroacetyl derivatives of 2,3-dihydro-5-methyl-2-phenyl-3 H-pyrazol-3-one respectively. The complexes crystallized from solution with stereochemistry that have remarkable deviations from each other and modest deviation from octahedral geometry. X-ray diffraction studies revealed that in 2 an ethoxy moiety was introduced to one of the two ligand anions rather than on the molybdenum atom due to a deprotonation reaction between the complex and ethanol solvent. This unusual reaction in 2 lead to the destruction of the Mo-VI atom as a pseudo two-fold centre of inversion of the ligands, the non planarity of both the pyrazole rings and chelate rings of the ligand anions as is observed in 1. The yellow complex 1 crystallized in the orthorhombic space group Iba2 with unit cell parameters, a = 9.6757(6) Angstrom, b = 19.854(3) Angstrom, c = 13.464(3) Angstrom; Z = 4 and D-x = 1.516 g cm(-3). The yellow complex 2 crystallized in the triclinic space group P (1) over bar with unit cell parameters, a = 8.706(8) Angstrom, b = 12.3155(15) Angstrom, c = 16.179(2) Angstrom; alpha = 107.268(10)degrees, beta = 95.060(9)degrees, gamma = 104.822(8)degrees; Z = 2 and D-x = 1.709 g cm(-3). The UV, IR and H-1 NMR spectral data of the complexes were reported.